International Labour Office & ebrary, Inc. (2011). Manual on the measurement of volunteer work. International Labour Office.
Chicago-referens (17:e uppl.)International Labour Office och Inc ebrary. Manual on the Measurement of Volunteer Work. Genève, Switzerland: International Labour Office, 2011.
MLA-referens (9:e uppl.)International Labour Office och Inc ebrary. Manual on the Measurement of Volunteer Work. International Labour Office, 2011.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.